Photochemical laser utilizing the 1Σ+g–3Σ–g vibronic transition in S2

An experimental investigation was made of the ¹Σ⁺_g–³Σ^–_g vibronic laser transition in molecular sulfur formed as a result of secondary reactions in the photodlssociation of COS by λ= 190–255 nm radiation. The population inversion preceding this transition was analyzed. The main experimental results were in agreement with the adopted model of the stimulated emission due to the ¹Σ⁺_g–³Σ^–_g transition in S₂. The emission spectrum was located mainly in the range of vibronic bands Δν= (λ_L ≈1.1 μ). The gain reached ~4×10^–3 cm^–1. The specific output energy was ~5×10^–4 J/cm³.